Wrench



Feb. zmifiw;

L. E. CLARK WRENCH Filed Oct. 18, 1921 i jaw and frame, and theutilization of a racle and sliding rack catch, together with. springvdevices for seating. the slidable j aw" and frame and also the rackcatch.

j ass ss. a. emana on Laenossii, wastitinerant.

I a *a pi eau n mania-st r 1a; 1921." Serial No. 508,56

Thall"ta/waistmayconcern: jj a l Beit known that I, L TH R EwCnAiut acitizen of the United States, residing at liatrosse} in the county of..Whithiah and State of ashington, have inventedcertain new (and usefulImprovements in Vl renches, of

which the following s a specification.

F By present invention? relates to improvements nwrenches, of that typeinvolving the use of a fined 12th,t 'slldtlblfi ad ustable The primaryobjectfof the invention is the provision of a tool of this characterwhich is comparatively inexpensive in cost of prov duction, involves apractical minimum numher of partsfwhich lnay with facilitybe adjustedfor use, and which is durable and proficient in service.

The inventionuconsists in certain novel ombinationsand arrangements ofpartsas will be hereinafter ully explained and pointed out in myappended cla m. a in the accompany ng drawings I have "illustrated onecomplete example of the physical embodiment of my invention wherein theparts are combined and ar .30 thus far devised. for the practicalapplicaranged according to thebest mode l have tion of the principles ofmy invention.

parts. v i

u Figure 2 is a transversesectionalview at lineQQ-Q ofFig. 1.

Figure 1 is aview in elevation of a wrench embodying my invention, partsbeing broken awayto disclose the construction of Figure 3 is a sectionalview of Fig. 1 at the line 3-3 of that figure.

Figure 4 is a sectionalview of the spring supporting bushing locatedwithin the a wrench shank.

Inthe preferred form of the invention as illustrated in the drawings thefixed aw 1 is integral: with the hollow shank 2, and the slidablyadjustable jaw 3 isintegral with theslidable frame 4: which enclosesaportion of the shank, boththe shank and frame beingrectangular inerosssection, as indicated 1n F 1g. 2.

j'lh slidable jaw and its frame are providedwith a stem .5 locatedwithin the hollow. shanktand the stem is secured to the perforatedlug 6which extends laterally of e the frameand projects through an open sideadjustedjand aids in be pushed toward of the shank, in order thatthestem may be afor guiding the movement of the movable jaw and itsframe while the latter is being holding the jaw in proper position.

'The movable aw is normally pressed toward the fixed j aw by a tensionspring? that is coiled about the stem 5 and interposed between the lug 6at one end and the sup porting bushing 8 at its other end. This bushingis located within the hollow shank and provided with a stud 9 having ahead 10,and the studprojects through and is slidable-in thelongitudinally extending slot 11 in the tool shank. At its ends thisslot is provided with notches 121 and 13, the

notch 12 being adapted to receive the stud 9 to. support the bushing inposition as indicated in Fig. 1, while the notch 13 is adapted toreceive the stud 9 when the spring 30131011 is released. 1 the spring iscontracted between the bush- Thus in Figure ing 8 and lug 6 and thespring urges the movable j aw toward the fixed. jaw. To release thespring, the bushing is turned, the stud 9 is turned with it and thetension of the spring forces the. bushing toward the end ofthe shank,and then by turning the stud 9 into thenotch 13 the bushing. is retainedin; this position withtension relieved from the spring. With the springtension released the movable jaw and frame may the fixed jaw by hand foradjustment. 1 i j For adjusting the spring pressed movable jaw the thumborfinger is pressed against the horn 14 which is integral with and projects from the jaw frame 4 and by pressure thereon the movable jaw maybe moved jaw against the tension 16 "fixed within the shank 2 to preventthe movable jaw being forced away from the fixed aw. This pawl or rackcatch is pivotedat 17 in the movable frame and the springIS within theframe bears against the trigger 19 forming one arm of the pawl, to holdthe pawl in contact with the rack bar. i a

Assuming the parts of the tool to hem position as shown in Fig. 1 theoperation of thedeviee is as follows. To adjust the slidable j aw awayfrom the fixed jaw pressur of the thumb or finger is applied to thethumb piece M and at thesame time the thumb may be slightly turned topress against the trigger 19. The trigger is thus moved. against thespring .lSto release the pawl from its rack bar 16, and the frame is nowfree to be moved against tension of the spring 7 foradjustingthe movablejaw.

In adjusting the tool tovenga-ge a bolt or nut the movable jaw isadjusted to approximate distance and then the jaws passed over theobject; pressureon the thumb piece 14 is then released permitting thespring 7 to exert its pressure against the movable jaw. and the aw 1sclosed over the ob ect. The rack catch 15 1s also released and thusenwith the rack her 16 to hold the inorable jaw in rigid relation to thefixed jaw, and the tool may be manipulated in usual manner.

Having thus fully described my invention, what I claim as new and desireto cure by Letters Patent is- The combination with the fixed jaw andhollow shank having a slot and a pair of notches therein, ot a movablejaw and in tegral frame, a stern on the frame, a spring on the stem abushing within the shank to support said spring, said bushing having astud slidable in the slot to engage either of said notches, a rack bar,and a spring pressed rack catch.

In testimony whereof I aflix my signature.

LUTHER E. CLARK.

